If you have 20.1, the no-brainer answer for tubes is ARC.
I use auto-formers with Maggies so it makes them easier to drive, but the big ARC amps will have no problem.
Frankly, to get what you want, I would go full ARC with the preamp and DAC too. Go fully balanced to gain extra db and other advantages that will mate well with most ARC tube amps (some of which are strictly balanced).
Maggies and ARC electronics are ideal combo...but one other thing that expands the soundstage is...believe it or not...a great sub with Maggies. A properly mated sub adds much more than just subterranean bass. REL did a great demo at CES...Even with reference Rockport speakers, the subs added a level of ambiance and scale that recreated more of the recording space.
I use auto-formers with Maggies so it makes them easier to drive, but the big ARC amps will have no problem.
Frankly, to get what you want, I would go full ARC with the preamp and DAC too. Go fully balanced to gain extra db and other advantages that will mate well with most ARC tube amps (some of which are strictly balanced).
Maggies and ARC electronics are ideal combo...but one other thing that expands the soundstage is...believe it or not...a great sub with Maggies. A properly mated sub adds much more than just subterranean bass. REL did a great demo at CES...Even with reference Rockport speakers, the subs added a level of ambiance and scale that recreated more of the recording space.